If you are going to have an electrician do it, and using new wiring, consider going ahead and running 50A and be done with it. That is what I would have preferred to do when I ran my circuit for our 50A rig. However, I did go back to 30A, mainly because at that time, the 50A wire alone would have cost me over three times as much as that needed for the 30A. As we only use the supply for one AC sometimes, mostly just to keep the batteries charged when not in use. the 30A was plenty for us. And if we are doing anything with it parked there, the TV set gets to run sometimes.